Answer:
a 72
Step-by-step explanation:
9x10=90, so in total he has 90 pencils. if he loses 18 of them that's 90-18 which is 72.
B.x+2
if you meant 9x+10y=4 then the x intercepts are (4/9,0) and the y intercepts are (0,2/5).
2=4x+7
